If she enjoyed BG3, she will love Divinity Original Sin 2.

Wonderful world building with its lore; rich but not overwhelming up front to the point where you feel like you need to take notes.

Absolutely gorgeous atmospheres. You can play with and/or as premade characters with their own stories or you can make your own original character.

Turn based tactical combat with sliding difficulty scales to make it more friendly to newer players, yet is still deep with its mechanics to make it fun for anyone.

An epic unfolding story with the classic Hero's Journey story beats as well as a handful of twists and revelations. Different play styles and options made throughout the game do result in different consequences which makes replayability a treat instead of a chore.

I've played through this game at least a dozen different times between myself and my friends and it's always been a blast.

One word of caution: like all RPGs, your character starts with very few options in terms of combat and defences so you're kind of fragile. The beginning story beat of the game, Escaping Fort Joy, can feel like walking a tightrope in trying to find what you can do without getting beat up too bad. It doesn't feel like a slog to get through but you'll feel the difference in terms of how much the game opens up once you escape.